Named parameters


Current in Python version, needs to use `?`
```py
cursor.execute(
    "update users set name = ? where email = ?",
    ("Alice Smith", "alice@example.com"),
)
```

It would be great to support named parameters like below, thanks! ☺️

```py
cursor.execute(
    "update users set name = :name where email = :email",
    {"name": "Alice Smith", "email": "alice@example.com"},
)
```